//
//  UIImage+Conveniently.m
//  app
//
//  Created by 刘华舟 on 15/4/22.
//  Copyright (c) 2015年 hdaren. All rights reserved.
//

#import "UIImage+Conveniently.h"

@implementation UIImage (Conveniently)

//重新设置图片尺寸大小
+(UIImage*) OriginImage:(UIImage *)image scaleToSize:(CGSize)size
{
    return [UIImage OriginImage:image scaleToSize:size fileToRatio:1.0f];
}

//重新设置图片尺寸大小，文件大小
+(UIImage*) OriginImage:(UIImage *)image scaleToSize:(CGSize)size fileToRatio:(CGFloat)ratio{
    UIGraphicsBeginImageContext(size);  //size 为CGSize类型，即你所需要的图片尺寸
    
    [image drawInRect:CGRectMake(0, 0, size.width, size.height)];

    UIImage* scaledImage = UIGraphicsGetImageFromCurrentImageContext();
    
    UIGraphicsEndImageContext();
    NSData *imageData = UIImageJPEGRepresentation(scaledImage,ratio);
    
    scaledImage = [UIImage imageWithData:imageData];
    
    return scaledImage;   //返回的就是已经改变的图片
}

//重新设置图片尺寸大小
+(NSData*) dataOriginImage:(UIImage *)image scaleToSize:(CGSize)size{
    return [UIImage dataOriginImage:image scaleToSize:size];
}
//重新设置图片尺寸大小，文件大小
+(NSData*) dataOriginImage:(UIImage *)image scaleToSize:(CGSize)size fileToRatio:(CGFloat)ratio{
    UIGraphicsBeginImageContext(size);  //size 为CGSize类型，即你所需要的图片尺寸
    
    [image drawInRect:CGRectMake(0, 0, size.width, size.height)];
    
    UIImage* scaledImage = UIGraphicsGetImageFromCurrentImageContext();
    
    UIGraphicsEndImageContext();
    NSData *imageData = UIImageJPEGRepresentation(scaledImage,ratio);
    
    return imageData;   //返回的就是已经改变的图片NSData
}

//旋转图片 设置方向
+ (UIImage *)image:(UIImage *)image rotation:(UIImageOrientation)orientation
{
    long double rotate = 0.0;
    CGRect rect;
    float translateX = 0;
    float translateY = 0;
    float scaleX = 1.0;
    float scaleY = 1.0;
    
    switch (orientation) {
        case UIImageOrientationLeft:
            rotate = M_PI_2;
            rect = CGRectMake(0, 0, image.size.height, image.size.width);
            translateX = 0;
            translateY = -rect.size.width;
            scaleY = rect.size.width/rect.size.height;
            scaleX = rect.size.height/rect.size.width;
            break;
        case UIImageOrientationRight:
            rotate = 3 * M_PI_2;
            rect = CGRectMake(0, 0, image.size.height, image.size.width);
            translateX = -rect.size.height;
            translateY = 0;
            scaleY = rect.size.width/rect.size.height;
            scaleX = rect.size.height/rect.size.width;
            break;
        case UIImageOrientationDown:
            rotate = M_PI;
            rect = CGRectMake(0, 0, image.size.width, image.size.height);
            translateX = -rect.size.width;
            translateY = -rect.size.height;
            break;
        default:
            rotate = 0.0;
            rect = CGRectMake(0, 0, image.size.width, image.size.height);
            translateX = 0;
            translateY = 0;
            break;
    }
    
    UIGraphicsBeginImageContext(rect.size);
    CGContextRef context = UIGraphicsGetCurrentContext();
    //做CTM变换
    CGContextTranslateCTM(context, 0.0, rect.size.height);
    CGContextScaleCTM(context, 1.0, -1.0);
    CGContextRotateCTM(context, rotate);
    CGContextTranslateCTM(context, translateX, translateY);
    
    CGContextScaleCTM(context, scaleX, scaleY);
    //绘制图片
    CGContextDrawImage(context, CGRectMake(0, 0, rect.size.width, rect.size.height), image.CGImage);
    
    UIImage *newPic = UIGraphicsGetImageFromCurrentImageContext();
    
    return newPic;
}
@end
